Metered Pricing – This strategy measures usage and sets different prices based on usage. It may charge more or less for increased use.
For example the NY Times is planning to put up a pay wall in which users have to access a certain amount of articles for free. Once that number is passed they pay a fee for access of more articles. Porn sites do the same thing. Many will give away a certain amount before requiring you to pay for more access. Don’t pretend you don’t know what I’m talking about. Porn is the biggest business on the internet.
Obviously utilities tend to follow this model.
The buzz is that we’re also going to start seeing this crop up with smartphones. In an effort to reduce congestion Verizon and AT&T are talking seriously about adding metered pricing to their plans.